JP4689485B2 - Chassis dynamometer vehicle fixing device - Google Patents

Description

  The present invention relates to a technique for fixing a vehicle to a chassis dynamometer.

In a chassis dynamometer that measures the various characteristics of an automobile by rotating the driving wheels of the automobile on a roller, it is necessary to fix the car body on the roller, fix the vehicle body, and perform the measurement. is there.
As a technique for fixing such a vehicle, a technique of connecting a pole installed in front (or rear) of the vehicle and a front part (or rear part) of the vehicle with a chain provided with a length adjusting mechanism is known. (For example, Patent Document 1)
JP-A-10-307082

Now, in order to perform accurate measurement, it is necessary to fix the vehicle in a stable state.
However, during operation of the chassis dynamometer, a force acts between the rotationally driven roller and the driving wheel of the automobile, so that the static fixing device as described above fixes the position of the automobile at a fixed position. However, the positional relationship between the roller and the driving wheel of the automobile may change.

In such a case, since the grounding resistance of the driving wheel to the roller changes due to the movement of the center of gravity of the automobile, the load applied / absorbed to the driving wheel from the roller deviates from a desired value, and the measurement accuracy deteriorates. Will do.
Therefore, an object of the present invention is to provide a vehicle fixing device for a chassis dynamometer that can stably fix the vehicle even during operation of the chassis dynamometer.

  In order to achieve the above object, the present invention provides a fixing device for fixing the automobile to a chassis dynamometer provided with a roller for placing a driving wheel of the automobile, and an automobile having the driving wheel placed on the roller. A plurality of belt fixing mechanisms for fixing the vehicle, position detecting means for detecting the position of the automobile, and a fixing control device. Here, each belt fixing mechanism includes: a belt provided with a connecting portion for connecting to the automobile at an end portion; and a belt winding driving unit that is fixedly installed and winds and fixes the belt. The fixed control device acquires the position of the vehicle detected by the position sensor during operation of the chassis dynamometer performed by driving the roller, and sets the acquired position of the vehicle. Accordingly, each of the belt take-up drive units of each of the belt fixing mechanisms is controlled so that the position of the automobile detected by the position detecting means matches a preset appropriate fixing position. .

  According to such a vehicle fixing device for a chassis dynamometer, the position of the automobile is monitored by the position detection means during operation of the chassis dynamo where the roller is driven, and the position of the automobile is determined between the roller and the driving wheel. In case of deviation from the proper fixing position due to the force acting in between, the belt control device controls each belt fixing device so that the position of the car returns to the proper fixing position by the fixing control device, and adjusts the belt winding / feeding amount Control. Therefore, the vehicle can be stably fixed even during operation of the chassis dynamometer.

  Note that such a chassis dynamometer fixing device is provided with two belt fixing mechanisms such that each belt take-up drive unit is disposed in front of the automobile and spaced apart in the left-right direction of the automobile. One belt fixing mechanism and two belt fixing mechanisms provided so that each belt take-up drive unit may be arranged behind the automobile in the left-right direction of the automobile. By doing so, the position of the vehicle can be arbitrarily adjusted in the front-rear and left-right directions by controlling each belt mechanism in the fixed control device.

  Further, in such a chassis dynamometer fixing device, the position detection means detects the position of the drive wheel placed on the roller, and the position detection means detects the position of the drive wheel. Each of the belt take-up drive units of each belt fixing mechanism is controlled so that the position of the driven wheel coincides with a preset appropriate fixing position of the driving wheel on the roller. It is preferable to fix the driving wheel directly related to the measurement at an appropriate fixing position on the roller with high accuracy during the operation of the chassis dynamometer.

  As described above, according to the present invention, the vehicle can be stably fixed even while the chassis dynamometer is in operation.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 schematically shows the configuration of the chassis dynamometer according to this embodiment.
Here, FIG. 1a is a schematic top view of the chassis dynamometer, and FIG. 1b is a schematic side view of the chassis dynamometer.
As shown in the figure, this chassis dynamometer is a chassis dynamometer for a four-wheel drive vehicle. The vehicle is advanced on the fuselage 1, the front wheel is positioned on the front wheel roller 2, and the rear wheel is rear-mounted. After positioning on the wheel roller 3, the vehicle is fixed to the drive unit 1, and the fixed vehicle is connected to the front wheel roller 2 and the rear wheel roller 3 while running the fixed vehicle. Various characteristics of automobiles are measured with a dynamometer.

Here, the fixing of the automobile to the driving body 1 is performed using four belt fixing devices 4, a fixing control device 5, and four position sensors 6.

Each belt fixing device 4 has the same configuration.
Now, taking the belt fixing device 4 on the left front side of the automobile as an example, the configuration is shown in FIG. In FIG. 2, a is the upper surface of the belt fixing device 4 on the left front side, b is the right side surface of the belt fixing device 4 on the left front side toward the rear of the vehicle, and c is the left front side. The left side surface of the belt fixing device 4 of the belt fixing device 4 is shown on the left side, and d is the front side of the belt fixing device 4 on the left front side.

  As shown in the figure, the belt fixing device 4 includes a base 41 fixed to the main body 1, a motor unit 42 fixed to the base 41, a gear wheel 43 rotatably supported on the base 41, and a gear. A speed reduction device 44 coupled to the wheel 43 and a belt take-up shaft 45 rotatably supported by the base 41 are provided. The gear wheel 43 is connected to the belt take-up shaft 45 and meshes with the motor shaft of the motor to convert the rotational motion of the motor shaft into the rotational motion of the belt take-up shaft 45.

The belt fixing device 4 includes a belt 46 wound around the belt winding shaft 45 and a hook 47 provided at the tip of the belt 46.
In such a configuration, the motor unit 42 is used to wind up the belt 46 in an arbitrary amount, the arbitrary amount is fed out, or the speed reducer 44 is used to fix the belt 46 in the state of being wound up in an arbitrary amount. Can be done.
Returning to FIG. 1, next, the four position sensors 6 are provided corresponding to the four wheels of the automobile, respectively.
Each position sensor 6 has the same configuration. FIG. 3A shows the upper surface of the position sensor 6 provided corresponding to the right front wheel, and b shows the rear side of the position sensor 6 provided corresponding to the right front wheel. Represents the appearance of the left side face.
As shown in the figure, the position sensor 6 is mounted on the roller 2/3 (the front wheel roller 2 in the illustrated example) and corresponds to the wheel 100 corresponding to the position sensor 6 (the right front wheel in the illustrated example). The position in the two directions indicated by the arrows in FIG. 3a, that is, the position of the rotation center of the wheel in the direction of the rotation axis of the roller 2/3 and the horizontal position of the rotation center of the corresponding wheel 100 and the roller 2/3 An optical sensor 61 is provided for detecting a position in a direction perpendicular to the rotation axis.

  Returning to FIG. 1, the fixed control device 5 is connected to each position sensor 6 as described above, and acquires the position of the center of each wheel detected by the position sensor 6. The fixing control device 5 is connected to each belt fixing device 4 as described above, and drives and controls the motor unit 42 and the speed reduction device 44 of each belt fixing device.

Hereinafter, a vehicle fixing operation in such a chassis dynamometer will be described.
First, the worker advances the automobile onto the body 1 and positions the front wheel on the front wheel roller 2 and the rear wheel on the rear wheel roller 3 as shown in FIG. Next, the worker hooks the hook 47 at the tip of the belt 46 of the two belt fixing devices 4 in front of the vehicle on the fixing hook fixed to the front part of the automobile. Similarly, the hook 47 at the tip of the belt 46 of the two belt fixing devices 4 at the rear of the vehicle is hooked on a fixing hook fixed to the rear part of the automobile. As these fixing hooks, a tow hook of an automobile may be used if possible.

Next, the operator operates the fixing control device 5, drives the motor unit 42 of each belt fixing device 4, winds up the belt 46 by a predetermined amount, fixes it with the reduction gear 44, and applies a predetermined tension. Fix the position of the car with the four belts you have.
Then, the worker activates the vehicle position restraining process of the fixed control device 5 and causes the fixed control device 5 to execute the process.
FIG. 4 shows the procedure of the vehicle position restraining process performed by the fixed control device 5.
As shown in the figure, in this process, first, the wheel center position detected by each position sensor 6 is obtained from each position sensor 6 (step 502), and set on the vehicle from the obtained wheel center position of each wheel. The position of a plurality of reference points is calculated (step 504), and each calculated reference point position is set as the reference position of the reference point from which the position is calculated (step 506). Here, as the plurality of reference points, the positions of the rotation centers of the four wheels of the automobile may be used as they are, or two fixing hook positions for fixing the belt 46 fixed to the automobile may be used. .

In this state, when the operation of the chassis dynamometer starts, the operator inputs that fact to the fixed control device 5. When the start of the operation of the chassis dynamometer is notified from the operator (step 508), the fixed control device 5 repeats the following processing.
That is, the wheel center position detected by each position sensor 6 is obtained from each position sensor 6 (step 510), and the positions of a plurality of reference points set on the vehicle are calculated from the obtained wheel center positions of the respective wheels. (Step 512) Based on the calculated position and reference position of each reference point, the movement direction and the movement amount of each reference point with respect to the reference position are calculated (Step 514), and each reference point position is returned to the reference position. Next, a winding / feeding control amount of each belt fixing device 4 for moving the distance according to the calculated movement amount is calculated (step 516), and the motor of each belt fixing device 4 is calculated according to the calculated control amount. The unit 42 is driven, the belt 46 is wound / delivered and fixed by the speed reducer 44 (step 518), and the process is repeated.

The embodiment of the present invention has been described above.
As described above, according to the present embodiment, the position of the automobile is monitored during the operation of the chassis dynamo in which the roller 2/3 is rotationally driven, and when the position of the automobile deviates from the reference position, Feedback control is performed to control the winding / feeding amount of the belt 46 of the belt fixing device 4 so that the position returns to the reference position. Therefore, according to the present embodiment, the automobile can be stably fixed even while the chassis dynamometer is in operation.

It is a figure which shows the structure of the chassis dynamometer which concerns on embodiment of this invention. It is a figure which shows the structure of the belt fixing device which concerns on embodiment of this invention. It is a figure which shows the structure of the position sensor which concerns on embodiment of this invention. It is a flowchart which shows the vehicle position constraint process which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Drive body, 2 ... Roller for front wheels, 3 ... Roller for rear wheels, 4 ... Belt fixing device, 5 ... Fixing control device, 6 ... Position sensor, 41 ... Base, 42 ... Motor part, 43 ... Gear wheel 44 ... Deceleration device, 45 ... Belt winding shaft, 46 ... Belt, 47 ... Hook, 51 ... Jacking device, 52 ... Arm part, 53 ... Adjustment bar, 54 ... Contact block.

Claims (3)

A fixing device for fixing the automobile to a chassis dynamometer provided with a roller for mounting a driving wheel of the automobile,
A plurality of belt fixing mechanisms for fixing an automobile having driving wheels mounted on the rollers;
Position detecting means for detecting the position of the automobile;
A fixed control device,
Each belt fixing mechanism is
A belt provided with a connecting portion for connecting to the automobile at an end;
A belt winding drive unit that winds and fixes the belt that is fixedly installed;
The fixed control device includes:
During operation of the chassis dynamometer performed by driving the roller, the position of the automobile detected by the position sensor is acquired, and the position detection means detects the position of the automobile according to the acquired position of the automobile. A vehicle fixing device for a chassis dynamometer, wherein each of the belt take-up drive units of each belt fixing mechanism is controlled so that the position of the vehicle matches a preset proper fixing position of the vehicle. .
A vehicle fixing device for a chassis dynamometer according to claim 1,
As the plurality of belt fixing mechanisms, two belt fixing mechanisms provided so that each belt winding drive unit is disposed in front of the automobile so as to be spaced apart in the left-right direction of the automobile; and A vehicle fixing device for a chassis dynamometer, comprising: two belt fixing mechanisms provided so that each belt winding drive unit is disposed so as to be spaced apart in the left-right direction.
A vehicle fixing device for a chassis dynamometer according to claim 1 or 2,
The position detecting means detects a position of the driving wheel placed on the roller;
The fixing control device is configured so that the position of the driving wheel detected by the position detection unit matches a preset appropriate fixing position of the driving wheel on the roller. A vehicle fixing device for a chassis dynamometer, wherein each of the winding drive units is controlled.